Log Message:
Update to 1.4.16. From the changelog:

indexers:

* Fix handling of XML empty tag syntax when there's a quoted parameter right
  before the closing `/>`.  This caused `<title \ 
xml:lang="en-US"/>` to treat
  the body text as the document title.  Spotted by Gaurav Arora.

* omindex: Fix killing of filter child process if the parent process receives a
  signal.  Spotted by Gaurav Arora.

omega:

* Reject $setrelevant without an argument list.  This has never been documented
  as allowed, and previously crashed with a segfault.  Fixes #802, reported by
  Gaurav Arora.

* If there's an error opening the databases we now close any we managed to open
  successfully before the error so that things like $dbsize can't end up
  reporting values for a subset of the specified databases.

portability:

* Use our own autoconf cache variable namespace (xo_cv_ prefix instead of
  ac_cv_) to avoid colliding with standard autoconf macro use if config.site or
  a shared config.cache is used.  The former case caused a build failure for
  the OpenBSD port with 1.4.15, reported by Lucas R.